CVE-2026-81423 in Accept Stripe Payments Plugin
Summary
by MITRE • 09/05/2026
The Accept Stripe Payments WordPress plugin before 2.1.4 does not validate a user-supplied URL before using it in a redirect, allowing unauthenticated attackers to redirect visitors to an arbitrary external website, which can be leveraged for phishing.
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Analysis
by VulDB Data Team • 09/05/2026
The vulnerability identified within the Accept Stripe Payments WordPress plugin prior to version 2.1.4 represents a classic instance of Unvalidated Redirects and Forwards, categorized under CWE-601 in the Common Weakness Enumeration database. This security flaw stems from insufficient input validation mechanisms when handling user-supplied URL parameters. Specifically, the application accepts external input intended for payment redirection or transaction processing but fails to verify that this input corresponds to a trusted domain or an allowed list of destinations. Consequently, the software proceeds to execute a redirect operation using the unverified value provided by the client side without performing any sanity checks against a whitelist of legitimate endpoints.
From a technical perspective, the root cause lies in the lack of strict validation logic within the plugin's codebase responsible for processing payment flows or webhook responses. When an attacker constructs a malicious request containing a URL pointing to a phishing site controlled by them, the application blindly trusts this input and issues an HTTP redirect response to the victim's browser. This behavior exploits the trust relationship users typically have with established e-commerce platforms like Stripe. Because the redirection originates from a legitimate domain hosting the vulnerable plugin, victims are more likely to believe they are on a genuine payment page rather than recognizing it as a malicious diversion.
The operational impact of this vulnerability is significant in the context of social engineering and phishing campaigns. Attackers can leverage this flaw to create highly convincing phishing pages that mimic the appearance of legitimate Stripe checkout processes or merchant websites. By redirecting users from a trusted source to a fraudulent site, attackers can harvest sensitive credentials such as login details, credit card numbers, and personal identification information. This not only compromises individual user data but also erodes trust in the affected website and its associated payment infrastructure. The unauthenticated nature of this exploit means that no prior access or authentication is required, allowing any internet user to trigger the malicious redirect simply by visiting a crafted link or interacting with specific plugin features exposed on public-facing pages.
In alignment with the MITRE ATT&CK framework, this vulnerability facilitates techniques related to Phishing and Credential Harvesting, specifically under tactics like Initial Access and Collection. The ability to seamlessly transition users from a trusted environment to an attacker-controlled domain lowers the barrier for successful social engineering attacks. To mitigate this risk, developers must implement strict allow-list validation for all redirect URLs, ensuring that only pre-approved domains are permitted as targets. Additionally, implementing Content Security Policy headers can help restrict where browsers will navigate following redirects. Site administrators should immediately update the Accept Stripe Payments plugin to version 2.1.4 or later, which addresses this input validation deficiency and prevents unauthorized redirections from occurring.